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Intangible assets, net - Schedule of Estimated Amortization Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 12,495  
2020 12,371  
2021 8,757  
2022 8,008  
2023 3,967  
2024 and thereafter 16,214  
Net intangible assets $ 61,812 $ 74,354